Big Bang Theory star Kunal Nayyar has said he would love for Lisa Kudrow and Betty White to appear on the show.

The actor, who plays Raj in the CBS sitcom, suggested that the former Friends actress portray Penny's (Kaley Cuoco) mother, while White might be a good fit for Sheldon's (Jim Parsons) beloved 'Meemaw'.

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Nayyar also spoke of his desire for a Game of Thrones episode of Big Bang Theory and approved Mike & Molly star Reno Wilson's suggestion of a crossover between their shows and fellow Chuck Lorre production Two and a Half Men.

On how Howard's (Simon Helberg) marriage to Bernadette (Melissa Rauch) in May's finale will affect Raj and the gang during season six, Nayyar teased: "He was his brother, he was his bromance.

"[Raj has] already got a puppy, what's he gonna get next? Maybe he'll have 10,000 cats in his apartment."

He continued: "These characters, they have to evolve. They're getting older on the show, these are things that happen in everyone's life. People do get married... this is just a natural evolution. I wonder if we'll have Big Bang babies in the season finale?"